/* === CSS Variables for Theme System === */
:root {
    --bg-color: #0a0a0a;
    --text-color: #f0f0f0;
    --accent-color: #00d9ff;
    --accent-text-color: #000;
    --panel-color: #1a1a2e;
    --btn-color: #16213e;
    --border-color: #2a2a4a;
    --input-bg: #1a1a2e;
    --muted-color: #b0b0b0;
    --shadow-color: rgba(0, 217, 255, 0.15);
    --glow-color: rgba(0, 217, 255, 0.3);
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --error-color: #ff4444;
}

/* Light Theme */
.light-theme {
    --bg-color: #f8fafc;
    --text-color: #1a1a1a;
    --accent-color: #0ea5e9;
    --accent-text-color: #fff;
    --panel-color: #ffffff;
    --btn-color: #f1f5f9;
    --border-color: #e2e8f0;
    --input-bg: #ffffff;
    --muted-color: #64748b;
    --shadow-color: rgba(14, 165, 233, 0.15);
    --glow-color: rgba(14, 165, 233, 0.3);
    --success-color: #059669;
    --warning-color: #d97706;
    --error-color: #dc2626;
}

/* === Global Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-color), #1a1a2e);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    transition: all 0.3s ease;
}

/* === Animation Keyframes === */
@keyframes slide-in {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes glow-pulse {
    0%, 100% { box-shadow: 0 0 10px var(--glow-color); }
    50% { box-shadow: 0 0 20px var(--glow-color), 0 0 30px var(--glow-color); }
}

/* === Page Controls === */
.page-controls {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: 15px;
    align-items: center;
}

.language-switcher button {
    background: var(--btn-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-switcher button.active,
.language-switcher button:hover {
    background: var(--accent-color);
    color: var(--accent-text-color);
    border-color: var(--accent-color);
}

.theme-switcher button {
    background: var(--btn-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.theme-switcher button:hover {
    background: var(--accent-color);
    color: var(--accent-text-color);
    transform: scale(1.1);
}

.light-theme .icon-sun { display: none; }
.icon-moon { display: none; }
.light-theme .icon-moon { display: inline; }

/* === Home Icon === */
.home-icon {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    font-size: 2rem;
    text-decoration: none;
    color: var(--accent-color);
    transition: all 0.3s ease;
    filter: drop-shadow(0 0 10px var(--glow-color));
}

.home-icon:hover {
    transform: scale(1.2);
    filter: drop-shadow(0 0 15px var(--glow-color));
}

/* === Container & Layout === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px 40px;
    animation: fade-in 0.8s ease-out;
}

/* === Header === */
header {
    text-align: center;
    margin-bottom: 40px;
    animation: slide-in 0.8s ease-out;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-color), #0ea5e9);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
    text-shadow: 0 0 30px var(--glow-color);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--muted-color);
    margin-bottom: 0;
}

/* === Description Section === */
.description {
    background: linear-gradient(135deg, 
        rgba(26, 26, 46, 0.8), 
        rgba(26, 26, 46, 0.6));
    border: 2px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    backdrop-filter: blur(15px);
    box-shadow: 0 10px 40px var(--shadow-color);
    animation: slide-in 0.8s ease-out 0.2s both;
}

.description p {
    font-size: 1.1rem;
    color: var(--muted-color);
    margin: 0;
    text-align: center;
}

/* === Important Notice === */
.important-notice {
    background: linear-gradient(135deg, 
        rgba(255, 170, 0, 0.15), 
        rgba(255, 170, 0, 0.05));
    border: 2px solid var(--warning-color);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 30px;
    display: flex;
    align-items: flex-start;
    gap: 15px;
    animation: slide-in 0.8s ease-out 0.3s both;
}

.notice-icon {
    font-size: 1.5rem;
    color: var(--warning-color);
    margin-top: 2px;
}

.important-notice p {
    color: var(--text-color);
    margin: 0;
    font-size: 0.95rem;
}

/* === Main Content Layout === */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 50px;
}

/* === Form Sections === */
.form-section, .output-section {
    background: linear-gradient(135deg, 
        rgba(26, 26, 46, 0.8), 
        rgba(26, 26, 46, 0.6));
    border: 2px solid var(--border-color);
    border-radius: 25px;
    padding: 35px;
    backdrop-filter: blur(15px);
    box-shadow: 
        0 12px 40px var(--shadow-color),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: slide-in 1s ease-out 0.4s both;
}

.section-title {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 25px;
    text-align: center;
    font-weight: 600;
}

/* === Form Groups === */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 1rem;
}

/* === Input Styles === */
input[type="file"],
input[type="text"],
select,
textarea {
    width: 100%;
    padding: 15px;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

input[type="file"]:focus,
input[type="text"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--glow-color);
}

input[type="file"] {
    padding: 12px;
    cursor: pointer;
}

textarea {
    resize: vertical;
    min-height: 200px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

/* === File Info Canvas === */
.file-info {
    margin: 20px 0;
    display: none;
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.canvas-header h3 {
    color: var(--accent-color);
    font-size: 1.1rem;
    margin: 0;
}

.clear-button {
    background: var(--error-color);
    border: none;
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.clear-button:hover {
    background: #ff6666;
    transform: scale(1.05);
}

#fileListCanvas {
    width: 100%;
    height: 200px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--input-bg);
    cursor: default;
}

/* === Buttons === */
.generate-button {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--accent-color), #0ea5e9);
    color: var(--accent-text-color);
    border: none;
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.generate-button:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 12px 25px var(--shadow-color),
        0 0 20px var(--glow-color);
}

.generate-button:active {
    transform: translateY(0);
}

.generate-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.generate-button:hover::before {
    left: 100%;
}

/* === Output Area === */
.output-area {
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
    color: var(--text-color);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* === Tools Grid Section === */
.tools-grid-section {
    background: linear-gradient(135deg, 
        rgba(26, 26, 46, 0.8), 
        rgba(26, 26, 46, 0.6));
    border: 2px solid var(--border-color);
    border-radius: 25px;
    padding: 35px;
    backdrop-filter: blur(15px);
    box-shadow: 
        0 12px 40px var(--shadow-color),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    margin-bottom: 50px;
    animation: slide-in 1s ease-out 0.5s both;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.tool-card {
    background: linear-gradient(145deg, var(--panel-color), var(--btn-color));
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 25px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.tool-card:hover {
    transform: translateY(-8px) scale(1.03);
    border-color: var(--accent-color);
    box-shadow: 0 15px 45px var(--shadow-color), 0 0 20px var(--glow-color);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    filter: drop-shadow(0 0 10px var(--glow-color));
}

.tool-card h3 {
    font-size: 1.25rem;
    color: var(--text-color);
    margin-bottom: 10px;
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--muted-color);
    flex-grow: 1;
    margin-bottom: 20px;
}

.card-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-color), #0ea5e9);
    color: var(--accent-text-color);
    border: none;
    padding: 12px 25px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.card-button:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 217, 255, 0.3);
}

/* === FAQ Section === */
.faq-section {
    background: linear-gradient(135deg, 
        rgba(26, 26, 46, 0.8), 
        rgba(26, 26, 46, 0.6));
    border: 2px solid var(--border-color);
    border-radius: 25px;
    padding: 35px;
    backdrop-filter: blur(15px);
    box-shadow: 
        0 12px 40px var(--shadow-color),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: slide-in 1s ease-out 0.6s both;
}

details {
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}

details:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 15px var(--shadow-color);
}

summary {
    background: var(--btn-color);
    padding: 20px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-color);
    transition: all 0.3s ease;
    user-select: none;
}

summary:hover {
    background: var(--accent-color);
    color: var(--accent-text-color);
}

details[open] summary {
    background: var(--accent-color);
    color: var(--accent-text-color);
}

details p {
    margin-top: 15px;
    color: var(--muted-color);
    padding: 20px;
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.3), rgba(26, 26, 46, 0.1));
    border-radius: 12px;
    border-left: 3px solid var(--accent-color);
    animation: slide-in 0.3s ease-out;
}

/* === Responsive Design === */
@media (max-width: 768px) {
    .container {
        padding: 60px 15px 30px;
    }
    
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .page-controls {
        position: static;
        justify-content: center;
        margin-bottom: 20px;
    }
    
    .home-icon {
        position: static;
        display: block;
        text-align: center;
        margin-bottom: 20px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .form-section, .output-section {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 40px 10px 20px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .form-section, .output-section {
        padding: 20px;
    }
    
    input[type="file"],
    input[type="text"],
    select,
    textarea {
        padding: 12px;
    }
    
    .generate-button {
        padding: 15px;
        font-size: 1rem;
    }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* === Print Styles === */
@media print {
    .page-controls,
    .home-icon,
    .generate-button,
    .tools-grid-section {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}